My installation of base121, etc212 and man121 seem to went okay. But 
when I run the booter I get this error message:

Booting...File 'netbsd" not found
Could not open kernel "(0,?)netbsd".

What does this mean?

Here's my config:
Mac SE/30
8MB ram
240MB hard drive with 140mb Mac/OS partition, 16MB swap and 90MB 
usr/root partition.
I do have Mode32 7.5 installed
Also have Speed Douber 2 and Ram Doubler 2 installed.